The Great Basin Institute mapped 12 species of weeds in the Truckee River floodplain during the summer of 2008.
The species mapped are as follows: (the map uses a 4 letter code)
- Yellow starthistle (Centaurea solstitialis)
- Russian knapweed (Acroptilon repens)
- Spotted knapweed (Centaurea maculosa)
- Diffuse knapweed (Centaurea diffusa)
- Scotch thistle (Onopordum acanthium)
- Musk thistle (Carduus nutans)
- Tamarisk (Tamarix ramosissima, etc.)
- Purple loosestrife (Lythrum salicaria)
- Hoary cress (Cardaria draba)
- Tall whitetop (Lepidium latifolium)
- Medusahead (Taeniatherum caput-medusae)
- Canada thistle (Cirsium arvense)
- Rush skeletonweed (Chondrilla juncea)
- Dalmatian toadflax (Linaria dalmatica)
- Yellow toadflax (Linaria vulgaris)